Some failure-to-coerce tests for type system.
Some failure-to-coerce tests for type system.

dglazkov/tree-builder-builder,chunmun/tree-builder-builder,dglazkov/tree-builder-builder,loyso/tree-builder-builder,loyso/tree-builder-builder,chunmun/tree-builder-builder,loyso/tree-builder-builder,chunmun/tree-builder-builder,dglazkov/tree-builder-builder